The costume head of the Lake Erie Crushers' bear, Stomper, disappeared in August from the club's ballpark in Avon, west of Cleveland. The team believes a thief took the head, possibly because a door was left unlocked.
A local television station reports the mascot could not appear at the season's last eight games.
A Crushers online contest called "Where's Stomper?" had described an Ohio landmark where the mascot supposedly stopped. Fans who guessed correctly could win free tickets.
The team says it won't ask any questions if Stomper's head is returned. Crushers Vice President Dan Helm says it was custom-made and cost "a couple thousand dollars."