Hello and welcome to the forums! I hope your stay here is pleasant. Use the search tool BEFORE you post and others won't flame you.
How you do it is you place a trigger zone and and your entity and in the properties of the entity set "Spawn At Start" to no and "Spawn After Delay" to yes, but don't enter any numbers in or it won't work. Then, in the properties of the trigger zone, set the main script to plrinzoneactivateused and in the "If Used" column put the the name of the entity. If you want to play a video before it spawns, put your video in the "Videobank" folder and set up a story zone with the video attached to it. Have fun
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