What a croc! Loveable Lyle livens up a summer's day. When the Primm family moves into their New York City apartment, their son Joshua is surprised to find a crocodile in the tub. The multi-talented Lyle quickly becomes part of the family, but a nasty neighbor, Mr. Grumps, has it out for the reptile, and it is only a matter of time before he accuses Lyle of frightening his cat. Lyle is shipped off to the zoo, but his old showbiz partner, Hector P. Valenti, jailbreaks him just in time to save the day when Mr. Grumps' brownstone catches fire.