Some versions of the show may introduce new racers part-way into the race. The first instance of such a twist was the "Invasion" twist on the second Chinese celebrity version, where intruder teams had the opportunity to enter the competition mid-season should they to finish a leg with a pre-determined high placement. Should the invasion be successful, they would be allowed to continue in the race and the last placing original team of the original teams would be eliminated. If the invasion was not the new team would be eliminated regardless of the placement and the remaining teams would all continue onto the next leg. This twist was not used in later seasons of the Chinese celebrity edition, except for a team arriving on the second leg of the fourth Chinese celebrity season due to prior commitments (the first leg was a non-elimination round to account for this late arrival) - additionally the late arrivals did not have to achieve a particular placement.