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“Underdog” on BLU RAY – Compatibility Issues On ‘US’ Copies For UK Buyers…,
This review is from: Underdog [Blu-ray]  [US Import] (Blu-ray)
The American version of “Underdog” on a 'Disney’ BLU RAY is REGION-A LOCKED - so it WILL NOT PLAY on most UK Blu Ray players unless they're chipped to play 'all' regions (which the vast majority aren't). Don’t confuse BLU RAY players that have multi-region capability on the 'DVD' front – that won’t help.
Buy the standard UK issue instead. It's cheap - a looker on BLU RAY - and a lot of family fun…