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Tonight's episode of "The Flash" (7 p.m., CW/Ch. 30) is the first-half of a two-part crossover with "Arrow" and features our heroes doing battle with the evil Vandal Savage.

Vandal Savage arrives in Central City and attacks Kendra and Cisco. So Barry takes Kendra to Star City and asks Oliver and his team to hide her until he can figure out how to stop Vandal.

But then Hawkman shows up and flies off with Kendra.

Confused? Well, unless you watch both shows regularly — yeah, you're going to be confused.

Oh, the conclusion of this crossover airs Wednesday at 7 p.m. on CW/Ch. 30.

Elsewhere on TV ...

"Rudolph the Red-nosed Reindeer" (7 p.m., CBS/Ch. 2): Classic 1964 special.

"The Muppets" (7 p.m., ABC/Ch. 4): Joseph Gordon-Levitt performs a duet with Miss Piggy; Gonzo prepares for his next death-defying stunt; Dave Grohl challenges Animal to a drumming contest.

"The Voice" (7 p.m., NBC/Ch. 5): One contestant is eliminated.

"Grandfathered" (7 p.m., Fox/Ch. 13): Gerald gets a job as a host at Jimmy's restaurant.

"Manhattan" (7, 8, 9, 10 and 11 p.m., WGN): With the project faltering, Charlie turns to an unlikely partner for help.

"Fresh Off the Boat" (7:30 p.m., ABC/Ch. 4): Jessica and Honey's friendship is strained by a disagreement over an investment property; Louis' friend Barry overstays his welcome.

"The Grinder" (7:30 p.m., Fox/Ch. 13): Dean is asked to film a spinoff of his "The Grinder" TV series that will provide closure for his popular role, but has problems dealing with being replaced by his character's TV brother.

"Agents of S.H.I.E.L.D." (8 p.m., ABC/Ch. 4): Ward sets his revenge plan wreaks in motion; Coulson proves he will do anything to settle a score.

"Chicago Med" (8 p.m., NBC/Ch. 5): Dr. Rhodes must confront his past when he treats a close family friend who's been impaled by glass.

"Scream Queens" (8 p.m., Fox/Ch. 13): The Chanels go shopping on Black Friday, but the Red Devil wants to foil their spending spree.

"iZombie" (8 p.m., CW/Ch. 30): Babineaux is shocked to realize that he used to date a murder victim.

"Chicago Fire" (9 p.m., NBC/Ch. 5): Boden believes Maddox is behind Serena's accusations.

"Girlfriends Guide to Divorce" (11 p.m., Bravo): In the Season 2 premiere, Abby becomes "the face of divorce" for a chic lifestyle website and is once again forced to live a lie to hide her complicated relationship with her estranged husband.

"Finding Carter" (11 p.m., MTV): Carter's relationship with Jared is tested; Max has to deal with the aftermath of his father's trial.

"Chrisley Knows Best" (11 p.m., USA): Todd wants everyone in peak form for a friend's annual sports-themed barbecue.

"Donny!" (11:30 p.m., USA): Donny is showered in positive attention for accidentally coming out … although he's not gay.