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You knew that this was going to happen, right? That "The Flash" and "Arrow" would cross over to each other's shows — given that the former was introduced on the latter and the latter appeared in the premiere of the former.

In tonight's episode of "The Flash" (7 p.m., CW/Ch. 30), Oliver/Arrow (Stephen Amell),

Felicity (Emily Bett Rickards) and Diggle (David Ramsey) come to Central City to investigate a case involving a deadly boomerang. And Barry/Flash asks Oliver for help dealing with his latest meta-human foe.

Unfortunately, things don't go as planned and Arrow has to save Central City from the Flash.

In Wednesday's episode of "Arrow" (7 p.m., CW/Ch. 30), Oliver, Arsenal (Colton Haynes) and Diggle track down theboomerang-wielding killer — and get some help from The Flash.

In the world of comic-book TV, this is a big deal.

Also tonight, there's a big instate men's college basketball battle up in Logan. The Utah State Aggies are hosting the BYU Cougars (7 p.m. CBS Sports Network) in what has become an extremely heated rivalry in recent years.

In addition to the action on the court, expect to see the Aggie fans at their best.

Elsewhere on TV …

"Toy Story That Time Forgot" (7 p.m., ABC/Ch. 4): A post-Christmas playdate takes a scary turn in this new animated special.

"The Voice" (7 p.m., NBC/Ch. 5): Three contestants are eliminated.

"Christmas with the Mormon Tabernacle Choir" (7 p.m., PBS/Ch. 7): This year's special (taped last year) features Alfie Bowe and Tom Brokaw.

"The Flash" (7 p.m., CW/Ch. 30): In the first half of a crossover with "Arrow" (which concludes Wednesday), Barry and Oliver try stop a meta-human who is using his ability to control people's emotions to rob banks.

Men's college basketball (7 p.m., CBSSN): BYU at Utah State

"A Charlie Brown Christmas" (7:30 p.m., ABC/Ch. 4): Classic 1965 animation. (Repeat)

"Marvel's Agents of S.H.I.E.L.D." (8 p.m., ABC/Ch. 4): The team races Hydra to locate the ancient city.

"Marry Me" (8 p.m., NBC/Ch. 5): Casey competes with her two fathers over the time and attention of their favorite cousin.

"New Girl" (8 p.m., Fox/Ch. 13): A girl fight breaks out between Jess and Cece.

"Supernatural" (8 p.m., CW/Ch. 30): Sheriff Jody calls Sam and Dean for help.

"About a Boy" (8:30 p.m., NBC/Ch. 5): Fiona and Will go on a double date.

"The Mindy Project" (8:30 p.m., Fox/Ch. 13): Jeremy and Morgan babysit Lauren's infant son.

"Forever" (9 p.m., ABC/Ch. 4): A British aristocrat is found dead in Central Park.

"Chicago Fire" (9 p.m., NBC/Ch. 5): A couple is trapped in a house fire.