this works.
$connection_type="posts_to_pages";
$items = p2p_type($connection_type)->get_adjacent_items( $episode_id );
if ( $items['previous'] )
echo get_permalink($items['previous']->ID);
this works.
$connection_type="posts_to_pages";
$items = p2p_type($connection_type)->get_adjacent_items( $episode_id );
if ( $items['previous'] )
echo get_permalink($items['previous']->ID);